Cuba’s communist government is trying to shake off the yoke of at least one capitalist empire – Microsoft Corp. – by joining with socialist Venezuela in converting its computers to open-source software. Both governments say they are trying to wean state agencies from Microsoft’s proprietary Windows to the open-source Linux operating system, which is developed by a global community of programmers who freely share their code. “It’s basically a problem of technological sovereignty, a problem of ideology,” said Hector Rodriguez, who oversees a Cuban university department of 1,000 students dedicated to developing open-source programs.